3x+2y-z=12
6x -y+3z=19
4x+2y+4z=20
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The expression 42 plus 57 shows how much money nate spent at a store .which expression also shows how much money nate spend

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?